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On 32-bit x86, get the vsyscall address from the AUX vector #963

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On 32-bit x86, get the vsyscall address from the AT_SYSINFO AUX vector entry, rather than looking it up in the vDSO. This avoids the need to link in all the vDSO code if it isn't otherwise needed. And, it's simpler, avoiding the need for the rustix_int_0x80 function.

@sunfishcode sunfishcode marked this pull request as draft December 6, 2023 21:59
@sunfishcode sunfishcode force-pushed the sunfishcode/prepare branch 2 times, most recently from 79953c7 to 0892b09 Compare December 6, 2023 22:27
On 32-bit x86, get the vsyscall address from the AT_SYSINFO AUX vector
entry, rather than looking it up in the vDSO. This avoids the need to
link in all the vDSO code if it isn't otherwise needed. And, it's
simpler, avoiding the need for the `rustix_int_0x80` function.
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